Late tectonic and metamorphic evolution of the Piedmont accretionary wedge (Queyras Schistes lustrés, western Alps): Evidences for tilting during Alpine collision

2009 ◽  
Vol 121 (3-4) ◽  
pp. 502-518 ◽  
Author(s):  
Stéphane Schwartz ◽  
Pierre Tricart ◽  
Jean-Marc Lardeaux ◽  
Stéphane Guillot ◽  
Olivier Vidal
Keyword(s):  
Western Alps ◽  
Accretionary Wedge ◽  
Metamorphic Evolution

scholarly journals Metasediments Covering Ophiolites in the HP Internal Belt of the Western Alps: Review of Tectono-Stratigraphic Successions and Constraints for the Alpine Evolution

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 411
Author(s):  
Paola Tartarotti ◽  
Silvana Martin ◽  
Andrea Festa ◽  
Gianni Balestro
Keyword(s):  
High Pressure ◽  
Western Alps ◽  
Metamorphic Evolution ◽  
Alpine Orogeny ◽  
Sedimentary Evolution ◽  
Hp Metamorphism ◽  
Tethys Ocean ◽  
Depositional Setting ◽  
Oceanic Rocks ◽  
Outer Band

Ophiolites of the Alpine belt derive from the closure of the Mesozoic Tethys Ocean that was interposed between the palaeo-Europe and palaeo-Adria continental plates. The Alpine orogeny has intensely reworked the oceanic rocks into metaophiolites with various metamorphic imprints. In the Western Alps, metaophiolites and continental-derived units are distributed within two paired bands: An inner band where Alpine subduction-related high-pressure (HP) metamorphism is preserved, and an outer band where blueschist to greenschist facies recrystallisation due to the decompression path prevails. The metaophiolites of the inner band are hugely important not just because they provide records of the prograde tectonic and metamorphic evolution of the Western Alps, but also because they retain the signature of the intra-oceanic tectono-sedimentary evolution. Lithostratigraphic and petrographic criteria applied to metasediments associated with HP metaophiolites reveal the occurrence of distinct tectono-stratigraphic successions including quartzites with marbles, chaotic rock units, and layered calc schists. These successions, although sliced, deformed, and superposed in complex ways during the orogenic stage, preserve remnants of their primary depositional setting constraining the pre-orogenic evolution of the Jurassic Tethys Ocean.

scholarly journals Tectono-metamorphic evolution of an evaporitic décollement as recorded by mineral and fluid geochemistry: The “Nappe des Gypses” (Western Alps) case study

Lithos ◽  
2020 ◽  
Vol 358-359 ◽  
pp. 105419
Author(s):  
Guillaume Barré ◽  
Pierre Strzerzynski ◽  
Raymond Michels ◽  
Stéphane Guillot ◽  
Pierre Cartigny ◽  
...  
Keyword(s):  
Western Alps ◽  
Fluid Geochemistry ◽  
Metamorphic Evolution

scholarly journals Thermal structure and metamorphic evolution of the Piemont-Ligurian metasediments in the northern Western Alps

2013 ◽  
Vol 106 (1) ◽  
pp. 63-78 ◽  
Author(s):  
François Negro ◽  
Romain Bousquet ◽  
Flurin Vils ◽  
Clara-Marine Pellet ◽  
Jeanette Hänggi-Schaub
Keyword(s):  
Thermal Structure ◽  
Western Alps ◽  
Metamorphic Evolution

scholarly journals Metamorphic Conditions of Neotethyan Meliatic Accretionary Wedge Estimated by Thermodynamic Modelling and Geothermobarometry (Inner Western Carpathians)

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1094
Author(s):  
Ondrej Nemec ◽  
Marián Putiš ◽  
Peter Bačík ◽  
Peter Ružička ◽  
Zoltán Németh
Keyword(s):  
High Pressure ◽  
Oceanic Crust ◽  
Early Cretaceous ◽  
Continental Margin ◽  
Late Jurassic ◽  
Hanging Wall ◽  
Western Carpathians ◽  
Accretionary Wedge ◽  
Metamorphic Evolution ◽  
Lower Temperature

Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. This paper deals with the metamorphic overprinting of the Inner Western Carpathians (IWC) Meliatic Triassic–Jurassic paleotectonic units after the closure of the Neotethyan Meliata Basin. Medium to high-pressure and lower temperature conditions were estimated by Perple_X pseudosection modelling, combined with garnet–phengite, calcite–dolomite and chlorite thermometers and chlorite–phengite and phengite barometers. The Late Jurassic subductional burial to a maximum 50 km depth was estimated from the Bôrka Unit continental margin fragments at 520 °C and 1.55 GPa. This is compatible with the metamorphic peak garnet–glaucophane–phengite assemblage of blueschist facies in metabasites. The Jaklovce Unit oceanic fragments were subducted to maximum 35–40 km at 390–420 °C and 1.1–1.3 GPa. Metabasalts and metadolerites contain winchite, riebeckite, actinolite, chlorite, albite, epidote and phengite. A glaucophane-bearing metabasalt recorded an intra-oceanic subduction in blueschist-facies conditions. Rare amphibolite-facies metabasalts of this unit indicate the base of an inferred oceanic crust sliver obducted onto the continental margin wedge. The Meliata Unit oceanic/continental margin flysch calciclastic and siliciclastic metasediments suggest the burial to approximately 15–20 km at 250–350 °C and 0.4–0.6 GPa. This is indicated by a newly formed albite, K-feldspar, illite–phengite and chlorite associated with quartz and/or calcite and dolomite in these rocks. Magnesio-hastingsite to magnesio-hornblende bearing metagabbro with newly formed metamorphic magnesio-riebeckite and actinolite is an inferred detached Meliatic block tectonically emplaced in a Permian salinar mélange in the Silica Nappe hanging wall. Reconstructed P–T paths indicate variable metamorphic conditions from the medium-pressure to high-pressure subduction of the Bôrka and Jaklovce units to the Meliata Unit shallow burial in an accretionary wedge during Late Jurassic to Early Cretaceous Meliaticum evolution. Mélange blocks of Meliaticum incorporate different juxtaposed Meliatic paleotectonic units exposed in nappe outliers overlying the IWC Gemeric and Veporic superunits.

Fault-related rocks: deciphering the structural–metamorphic evolution of an accretionary wedge in a collisional belt, NE Sicily

2011 ◽  
Vol 54 (8) ◽  
pp. 940-956 ◽  
Author(s):  
R. Cirrincione ◽  
E. Fazio ◽  
G. Ortolano ◽  
A. Pezzino ◽  
R. Punturo
Keyword(s):  
Accretionary Wedge ◽  
Metamorphic Evolution ◽  
Ne Sicily

Fluid and mass transfer along transient subduction interfaces in a deep paleo-accretionary wedge (Western Alps)

2021 ◽  
Vol 559 ◽  
pp. 119920
Author(s):  
Gabe S. Epstein ◽  
Gray E. Bebout ◽  
Samuel Angiboust
Keyword(s):  
Mass Transfer ◽  
Western Alps ◽  
Accretionary Wedge
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